1. An electrical discharge machine for processing a workpiece immersed in a process liquid, the electrical discharge machine comprising:a process tank for storing the process liquid into which the workpiece is to be immersed;
an electrode configured to perform a processing of the workpiece;
an axis configured to move the electrode and the workpiece relatively to each other; and
a controller configured to
acquire information that becomes an index of a process liquid level of the process liquid in the process tank; and
change axis feeding properties of the axis in accordance with the acquired information,
wherein the controller is further configured to change the axis feeding properties when the liquid level is determined as being above a level at which the process liquid does not spill from the process tank when a door of the process tank is in an open state.